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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You may want to look at php webmail lite / pro https://github.com/afterlogic/webmail-lite-8
One i want to try is libremail, but I ran out of time for now
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